Study on seismic isolated foundation and its input mechanism for extreme earthquake

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This study addresses the developing of the improved soil which reduces the response of the superstructure. The mechanical properties of the improved compound soil are investigated by laboratory tests. Then earthquake response behaviors of spread foundation model and base-isolated building in collision to retaining wall are discussed with improved backfill soil by shaking table tests. Furthermore analysis results by 3D-nonlinear FEM are also discussed to clarify the effect to the response reduction of structures during an extreme earthquake.